11780280369 has 135 divisors (see below), whose sum is σ = 21187528635. Its totient is φ = 6303828960.

The previous prime is 11780280331. The next prime is 11780280377. The reversal of 11780280369 is 96308208711.

The square root of 11780280369 is 108537.

It is a perfect power (a square), and thus also a powerful number.

11780280369 is a `hidden beast` number, since 1 + 1 + 7 + 8 + 0 + 280 + 369 = 666.

It can be written as a sum of positive squares in only one way, i.e., 1742645025 + 10037635344 = 41745^2 + 100188^2 .

It is not a de Polignac number, because 11780280369 - 2⁷ = 11780280241 is a prime.

It is a super-2 number, since 2×11780280369² (a number of 21 digits) contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (11780280469) by changing a digit.

It is a polite number, since it can be written in 134 ways as a sum of consecutive naturals, for example, 512186092 + ... + 512186114.

Almost surely, 2^11780280369 is an apocalyptic number.

11780280369 is the 108537-th square number.

11780280369 is the 54269-th centered octagonal number.

It is an amenable number.

11780280369 is a deficient number, since it is larger than the sum of its proper divisors (9407248266).

11780280369 is an equidigital number, since it uses as much as digits as its factorization.

11780280369 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 122 (or 50 counting only the distinct ones).

The product of its (nonzero) digits is 145152, while the sum is 45.

The spelling of 11780280369 in words is "eleven billion, seven hundred eighty million, two hundred eighty thousand, three hundred sixty-nine".